Feeding mechanism for machine tools



Jan. 20, 1931. G, D, SUNDSTRAND l1,789,886

FEEDING MECHANISM FOR MACHINE TOOLS Jan. 20, 1931'. G. D. sUNDsTRANDFEEDING MECHANISM FOR MACHINE TOOLS 3 Sheets-Sheet Filed Oct. 25, 1928-rRAvRPSE @Je of O'. J'wvzdf (WML, MM u (idg/5t Jan. 20, 1931.

G. D. SUNDSTRAND FEEDING MECHANISM FOR MACHINE TOOLS s Sheets-sheet s,

.Filed Oc't. 25, 1928 Patented Jan. 20, 1931 Y UNITED STATES PATENTori-SICE GUSTAF DAVID SUNDSTRAND, OF ROCKFORD, ILLINOIS, ASSIGNOR TOSUNDSTRAND MACHINE TOOL C0., OF ROCKFORD, ILLINOIS7 A CORPORATION OIEILLINOIS FEELING MECHANISM FOR MACHINE TOOLS` Application filed October275, 1928..' Serial No. 314,923.

The invention relates generally to feeding mechanisms' for movable toolor work supports and more particularly tol an improved mechanism foractuating' and controlling the 5 movements of the tool or work supportin a machine tool.

It is the general object of the invention to provide a new and improvedmechanism of simplified construction arranged to actuate such a supportat feed and traverse speeds in forward and reverse directions.

It is another object of the invention to provide such a mechanism withimproved and simplified control devices.

Another object is to provide a feeding mechanism embodying a pair offeed-traverse clutches together with operating leversfor said clutchesand a simplified trip dog mechay nism arranged to 'actuate the clutches`automatically. v l

Another object is to provide a simplified feed mechanism embodying apairof control devices togetherwith trip dogs movable with` the supportarranged to actuate either device.

.I'n pursuance of the foregoing and other objects,` the presentembodiment consists of a feed mechanism for a movable support embodyinga pair of feed-traverse clutches7 a pair of control devices for saidclutches interlocked to permit engagement of but one clutch at a timeand trip devices movable with the support arranged to actuate thecontrol device of the clutch then engaged.v

Further objects and advantages. of the invention will be lunderstoodfrom the following detailed description taken in connection work supportsuch as the table of a'milling machine, the View being approximatelyalong the line l-l of Fig. 2.

p Fig. 11 is a plan View illustrating'diagrammatically types of dogs foractuating the controls. I

Fig. 2 is a plan view along the yline 2 2 of Fig. l.

F ig; 3 is an elevation of theclutch control devices shown in Fig. 4.

Fig. 4 is a plan view of the clutch control devices shown in .3.

Fig. 5 is an enlarged fragmental plan view of a portion of the controlmechanism.

Fligs. 5? and 5b are fragmentary Views of the control mechanism.

Fig. Gis al section through the control mechanism` along the lines 6 6of Fig. 3.

Fig. 7 is a section through the control mechanism along ythe line (247of Fig. 3 showing the interlocking device for the' clutches. v

While the invention is susceptible ofembodiment in many ydifferentforms, there is shown in the drawings and will herein be described indetail one such embodiment,` with the understanding that the presentdisclo- `sure is tobe considered as an exemplication of the principlesofthe invention, and is not intended to limit 'the invention to theembodiment illustrated. The scope of the invention will be pointed outin the appended claims.

As'illustrated in the drawing@ the preferred form of the invention isdisclosed in operative relation with a work support 'or table 1 of amilling machine, which table is slidably mounted upon a base or bed 2 tomove along ways The feeding mechanism proper, that is the feed-traverseclutches and gearing, is embodied in a feed box or housing suitablysecured to the bed of the machine in a position directly beneath thetable l with the forward portion of the boX extending beyond the bed soas to provide for the mounting of the control mechanism as hereinafterdescribed. The feed mechanism.

partly in section is preferably lmounted in this manner so as to permitthe mechanism as a unit to be assembled separately from the machine andthen to be attached thereto, and also to permit of removal of the unitif desired.

As illustrated hereiin the table 1 is arranged tov be reciprocated bymeans of a feed screw 5 traveling with the table and rotatably mountedthereon, sad screw engaging tra a stationary nut which is located in asplit box or housing 6 that is secured to the upper portion of the feedboX 4. A gear 7 rotatably mounted within the housing 8 has a splinedconnection 9 with the feed screw 5 so that upon rotation of the gear 7in forward and reverse directions, the table 1 is reciprocated upon theways 3.

The feed mechanism is preferably actuated directly from the prime mover(not shown) of the machine by means includinga horizontally extendingshaft 10rwhich enters through the rear wall of the housing 4 and extendsforwardly through the housing andinto the forward portion thereof. lt iscontemplated that during operation of the machine, the shaft 10 will bedriven at a constant speed, the'feeding mechanism which will now bedescribed being arranged to be driven by this constant speed shaft andto actuate the table 1 at feed and traverse rates under the manualcontrol of an operator, or the automatic control of dog operated tripdevices.

As mentioned hereinbefore, the form ofthe invention illustrated in thedrawings provides a pair of feed-traverse clutches which clutches arepreferably arranged each to feed the table in one direction and totraverse the table in the opposite direction. Thus upon the completionof a feeding movement in one direction by the engagement of one clutchmember, the actuation of that clutch to its traverse position willreturn the table at a rapid or traverse rate. The traverse members ofthe clutches are preferably driven directly from the shaft 10 whereasthe feed members are driven through suitable reduction and feed changegearing so as to permit of changing the feed speed.

As shown in the drawings7 a pair of feedtraverse clutch members 11 and12 are rotatably mounted upon parallel shafts 13 and 14 respectivelywhich are supported intermediate the side walls 4a and 4b of thehousing.

I The clutch members 11 and 12 are preferably provide-d with gear teethformed integrally7 therewith so as to provide pinions 15 and 13` whichpinions mesh with the 7 on the feed screw.

To drive the clutch members at traverse speeds, a pair of intermeshingtraverse `gears 17 and 18 are rotatably mounted on. the shafts 13 and 14respectively. at one end of the clutch members. The gear 17 is drivenfrom the shaft 10 by means of the bevel gear 19.

keyed on said shaft. and an intermediato wear having a beveled gearportion 2() me with the bevel gear 19 and a pinion por on 21 meshingwith the gear 17, said cluster gear being rotatably mounted on a studsecured to the side wall 4b. rlhe gears 17 and 18 are provided withclutch iawe 23 and arranged to be engaged with traverse clutch jaws 25and 26 on the clutch members 11 and 12. As will be apparent, theintermeshing gears 17 and 18 are driven in opposite directions.

The opposite ends of the clutch members 11 and 12 are provided with feedclutch teeth 27 and 28 arranged to be engaged with corresponding clutchteeth 29 and 30 formed on a pair of intermeshi'ng feed gears 31 and 32which are rotatably mounted on the shafts 13 and respectively. Thesegears are arranged to be drivenat feed speeds from the shaft 10 througha pair of pickoff gears 33,32, shaft 35, worm 36, worm wheel 37, and agear 38 (Fig. 2) to which the worm wheel. is rigidly secured. Thepiclroii gear 33 is detachably mounted en the forward end of the shaft10 (Fig. 2) by means of a multiple-splined connection and meshes withthe pickoff gear which is similarly mounted upon the shaft 35. whichshaft is rotatably mounted in the housing 4 by means of a roller bearing39 and a ball bearing 39a. The worm 36 is secured to the shaft 35"intermediate said bearings (Fig. 1) and meshes with the worm wheel 37.The gear to which the worm wheel 37 secured is rotatably mounted on ashort shaft 40 which eX- tends transversely of the housing and ismounted intermediate the wall 4UL and a web 4C. 'lhe gear 38 meshes withthe feed gear 32. rllhus the feed gears 31 and 32 are continuouslyrotated in opposite directions through the gearing connection with theshaft 10, a detachable cover 41 being provided in front of the pickoifgears so as to permit changing of the gears.

In its preferred form the invention coutemplates that the feed gear 31will be driven in the opposite direction to the corresponding traversegear 17 so that the clutch member 11 is arranged to be engaged with feedgear 31 to feed the table in one direction (say towards the left of anoperator standing in front of the machine) or to be' engaged with thetraverse gear 17 to traverse the table to the right, and the clutchdevice 12 is arranged when engaged. to feed the table towards the right(of the same operator) or to rapid traverse the table towards the left.

For controlling the clutch members 11 and 12 the invention contemplatesa pair of control devices arranged to permit of manual operation of theclutches well automatic actuation thereof and so interloclred that butone'cf the clutches can be engaged at a time. As illustrated hereinthese control devices comprise yokes 42 and 43 (Figs. 1, 3 and whichyolres are mounted on transversely ei;- tending rods 44 and 45 slidablymounted in the side walls of the housing 4. The yoke 42 engages' theclutch member 11 and the yoke 43 engages the clutch 12. These yokes areoperable by means of au pair of bell crank devices 46 and 47 pivotallymounted on vertical studs 48 and 49 secured to the bottom wall of thehousing 4, one arm of each bell crank having a pin and slot connectionwith the rods 44 and 45. y

At the front of the housing are mounted two vertical shafts 51 and 52 atthe lower ends of which are secured radially extending arms 53 and 54,and at the upper ends of which are mounted manual controls in the formVof levers 55 and 56. These control levers are adapted to actuate theclutches 11 and 12 respectively, the arm 53 on, the shaft 51 beingconnected to the bell crank 46 by means of a link 57 and the arm 54 onthe` shaft 52 being connected to the bell crank 47 by a link 58.

In the exemplary form illustrated herein the gearing is such that thelevers 55 and 56 are in the full line positions shown in Fig. 4 when theclutch members 11 and v12 are in their disengaged or neutral positions,and

when they are moved to engage the clutches,

the levers move in the direction in which the table will move. Thus asshown diagrammatically in Fig. 4, the lever 56 when moved to the dot-tedline position will eect a traverse movement of the table to the right(viewed from the front of the machine) and when moved towards the leftinto the dotdash line position will elect a feed movement ofthe tabletoward the left. Similarly the lever 55 when moved to the left into itsdotted lineposition will effect a traverse movement of the table to theleft and when moved to the right into the dot-dash line position willeffeet a feed movement of the table to the right.

As shown most clearly in Figs. 3 and 7, the means for interlocking thecontrol devices to prevent simultaneous*engagement of the clutchescomprises a. collar 59 on the shaft 51 having opposed peripheral notches60 therein; A transverse slidable interlocking member 61 having aU-shaped portion provided with opposed teeth 62 is mounted so that whenmoved in either direction from the position shown in Fig. 7 (wherein theshaft 51 is illustrate-d in its position corresponding to the neutralposition oi the clutch 11) one of the teeth will enter one of thenotchesto prevent rotation of the shaft. The. other' end of the interlocking`member has a slot: 63

\ formedtherein arranged to receive al pin 64 carried on a collar 65secured to the shaft 52 of the control for clutch 12. As will be readilyapparent from Fig. 7 movement of one of the manual control levers willrotate the corresponding shaft and thereby prevent movement of the othershaft. n

In addition to a manual control of the clutches by means of the handlevers and 56 for obtaining certain movements of the Clutches, theinventionA contemplates the provision of trip devices operatedautomatically during movement of the movable support by means of dogssecured to the support. Pret'- erably these trip devices are adapted tostop the support at the end of a rapid traverse movement` inl eitherdirection, by .shifting thefengaged clutch member to neutral, or tocause a'rapidtraverse movement in the opposite direction at the end of aslow feedmovement by shifting the engaged. clutch member from itsfeedgto its traverse position.

As illustrated herein, ai pair of sleeves 66 and 67 (Figs: 3 and .4)having disk-like upper ends 68 and 69 are mounted on the upper end oftheshatts 51 and 52 and arranged for a limited rotary movement relativethereto.

These disks have rollers 70 and 71 mounted wards its neutral position,and a dog 73 being arranged to engage the roller 71 when the clutch 12is in its traverse position, to move the other control device towardsits neutral position. As illustrated in Figs. 3 and 4, the clutches arein neutral, it being apparent that if one ,of the clutches is moved intoeither kfeed kor traversev its vroller will be moved out from the tableor in `towards the table from the neutral position shown.

At theirllowerends the sleeves ,66 and 67 have segmental portions 66aand 67"L (Figs. 3 and 6) which entend. downwardly therefrom. TheseAsegmental portions are positioned between pairs of segments'74 and- 75.i

(Fig. 6) which` are fitted within cup shaped members 76 formedintegrally with the collars 59 and' 65. The segments 7 4 are secured tothe cup shapedfmembers by pins 77, the segments being arranged forrotary movement about the shafts 51 and 52in` the space intermediate thesegmental. portions 66a and 67n and the segments 74. The segments 74 and75 are normally held in their parted positions and iny abutment with thetwosides of the portions166'a and672L as shown in Fig. 6 by means ofcoil springs 78 and 79. A

The upper disks 68 and 69 are transverse] \r slotted at 80 as shown inFig. 5a so as to leave i solidpoirtions for the pinson which therollers70 and 71 arefsecuredand thereby form abutmentwalls 80"V(Figs.f5and 5a). The levers 55 and 56 are secured to mutilateddisks 81 aperturedto tit over the shafts 51 and-52 and positioned in said slots,thesedisks having angular sides 82 and 83 (Fig. 5) varranged to engage theabutment walls 80a.

Thus due to the relative position of the springs 78 and 79 and theabutment wall 80a andl the sides 82 and 83, the movement of a roller 70or 71 in a direction lto stop the traverse-movement of the table 'willrotate its sleeve 66 to engage the abutment 8Oa with the side 82 onthedisk 81 so as to positively communicate ,the motion to thelcorresponding clutch to disengage the same. Movement of a roller or 71in a direction to stop the feed movement of the table will, however', betransmitted to the clutch only through a yielding lost motion connectionwhich stores up sufficient power to throw the clutch past its Aneutralposition and into its other operative or return traverse position whichcauses reversal of movement of the table. Thus during movement of one ofthe rollers 70 or 71 in a direction to stop the feed movement of thetable, the abutment 8Oa of the corresponding trip device will first bemoved toward the side 83 of the disk 81 and during this approachmovement, the-segment 66a or 67EL of the control will move its segmentto compress the springs 78 and 7 9. The abutment 8Oa will then engagethe side 83 to move the disk 81 and disengage its clutch and uponcompletion of this disengagement the springs 78 and 79 will expand tothrow the clutch into its other engaged position whereby the table willbe moved at rapid traverse rate in the opposite direction.

The spring or load and fire devices just described constitute a portionof the means automatically operable to effect a shift of a clutch fromits feed position wherein the work support moves at a slow rate in onedirection, to its traverse position wherein the support will be lgiven areverse rapid traverse movement. Thus when it is desired to return thework at the end of the cutting stroke, a single clutch member may beshifted automatically to effect such return movement.

In order to permit of manual operation and of the use of dogs for merelystopping the table whether moving at a feed or traverse rate, theinvention contemplates that means will be provided for disabling theautomatically operable shift devices so as to prevent automatic reversemovement of the table. As illustrated herein, this disabling meanscomprises devices for locking the mutilated disks 81 to the disks 68 and69 of the controls so as to render ineffective the load and firedevices. ln the exemplary form of the invention the mutilated disks arepreferably secure.r to the shafts 51 and 52 as by means of pins 84 andmay be secured to the disks 68 and 69 bv means of locking fingers 85(Figs. 5 and 5b) pivotally mounted on the disks 8i and arranged toengage slots 86 in the disks 68 and 69. lVhen the finger 85 in theposition shown in 5a, the disks 68 and 8l are locked together rwhereaswhen in the position shown in Fig. 5b the mutilated disk 8l isreleasedand an automatic shifting cf the clutches is attained.

Assuming fo purposes of illustration that it is desired to have anoperating' cycle whereby there is, first, a rapid approach movement ofthe work to the cutter, second, a feed movement of the work past thecutter, and third, a rapid return movement of the work to its startingposition, a traverse dog 7 3 is positioned opposite the advance end ofthe work piece (not-shown) and traverse Clutch i2 is engaged manually bymoving the lever 56 to its upper or traverse position indicated indotted outline in Fig. fi to cause a rapid movement of the table andwork to ard the cutter. Engagement of the dog 78 with the roller 7l willpositively disengage the clutch l2 and .move it to neutral, the abutmentwall then engaging the mutilated disk side 82 to rotate the shaft 52.

The .hand lever 55 which controls the clutch ii is now operable to feedthe table in a direction to move the work past the cutter and whenshifted to its t-raverse position will effect a return of t-he table.The finger 85 of this device is therefore disengaged from itscorrespondingnotch 86. Feeding movement of the tabie toward the right ismanually initiated by movement of the lever 55 to its feed position(counter clock-wise in Figs. 2, 4, and 6), so as to move the clutch 11to its feed position. At the end of kthe feedingn'iovementa feed dog 72is arranged to enthe roller 70 and in so doing the disk 68 and itsintegra-l segmental portion 66l move the segment 7 5 in a clock-wisedirection (Fig. 6) against the act-ion of the springs 7 8 and 79. Duringthe initial portion of this movement the vsprings are compressed so thatwhen the clutch is shifted out of its feed position into neutral thesprings can expand to move the clutch past its neutral position and intoits traverse position. The springs are compressed until the abutmentwall 80a engages the side 83 of the mutilated disk whereupon furthermovement of the roller 7 O serves positively to shift the clutch ll intoneutral. The springs then effect a shift of the clutch il to itstraverse position. This causes a rapid return movement of the tableuntil a traverse dog 73 engaging the roller 70 causes the segmentalportion 66a to move the segment 7st and correspondingly the clutch, backto its neutral posit-ion.

vrt will be apparent from the foregoing that the invention provides notonly a conveniently operable mechanism for controlling the clutchesmanually but also provides a. simpliiied trip mechanism whereby theengaged clutch may either be shifted from its feed position to neutralor may bel shifted to its 'traverse position. This lends itselfparticularly for use in connection with the cycle herein out-linedwherein it is desired to haveI a rapid approach movement of the work tothe cutter, a feed movementin the same direction and a rapid returnmovement, although it will be readily apparent to those skilled in theart that with the manual and automatic trip devices illustrated, variousother Acycles of operation can readily be obtained,

lli)

Iy claim as :myfinvention ly 1; Infcombinationf-with .a reciprocatingsupport and actuating mechanism therefore 4embodying two feed-traverseclutches, a pair of control levers for said clutches interlocked sothatl but one' can be. in an operative positionata time, and a dog onsaid support adapted' to shift which ever lever isiiianoperativeposition.

2. In combination with a reciprocating support having trip dogs arrangedfor movementtherewith and actuating mechanism for said support embodyinga pair of feed-trav- `erseclutches, apair of control devices for said.`clutches each having two contact sur# faces-arranged foi-engagement bysaid trip dogs, and means to interlock said devices,

3. The combination with areciprocating support, ofactuatingmechanism,forfeeding and traversing said support embodying apair lof feed-traverse clutches, eacliof which is effective in itsfeedposition to move the.l

support in the reverse' direction from that in which it moves thelsupport when in itstravn erse position. y

4. In combina-tion, a reciprocating lsuprpoi't, and actuatingmechanisinfor feeding vand traversing said support embodying `a pair offeed-traverse clutches, eachof which is effective initsfeed positiontomovethe support in the reifersedirection 'from that in. which it movesthe support whenV in its traverse` position, a pair of control devices,for said clutches interlocked 'to preventsi` multaneous engagementthereof, and a dogon said support adapted to actuate either device whenits clutch is gage the clutch.

5. A feedf mechanism for a. milling machine table, comprising, incombination', a pair of'feedtraverse clutches, gearing between saidclutches and the table,'-a pair of hand levers arranged to `actuate saidclutches, and means arranged to prevent the simultaneous engagement ofsaid clutches.

ptween said devices and the support, a pair of trip devices forcontrolling said clutch devices, said trip devices cachV comprising apair of relatively movableinembers arranged directly to abut each otherwhen moved in 'one direction and having a lost motion conengaged, to -kdisen-V nection therebetween whenmoved in' the op-.

posite direction.

8: The combination of a movable support, i

mechanism for actuating said support em.- bodying a first clutch forimparting one movement to the support and a second clut-ch4 e for:imparting another .movement to said support, manually operable ymeansfor engagin g either of said clutches, a trip operatedv` control'forsaid clutches positively operable when moved in one direction todisengage said-rst clutch, said control having a lost motion connectionthereinr tofbe taken upV when thecontiol is ,movedV inthe oppositedirection, said' control being operable after thetaking up of saidconnection positively to disengage'said second clutch, a* spring'in saidcontrol arranged to be compressed during the 'taking up of said lostmotion-connection` and operable automaticallyto engage said first clutchimmediately upon the disengagement of said second clutch, and

means operable to prevent suchautomatic engagement of. said. firstclutch.

9. The combinationof a movable support,

mechanism` for actuating saidI support" eme,

bodying a first 'clutch for imparting one movement to the support and asecondfclutch for imparting another movement'to vsaidsupport, manuallyoperable means for engaging either of said fclutches, a tripoperatedcontrol for saidclutohes positively operable when moved in onedirectionto disengage said first clutch, said controlhaving a lostmotionconnect-ion thereinA to be taken up when; the lcontrol is moved inthe opposite direction, said control being'operable after thextakin'gfupof said connection positively to. disengage said second clutch, aspringin` saidf'control arranged to be compressed duringtlie taking upof said lost motion 'connectionand operable'automatically toengagesaidfirst clutch immediatelvupon thedisengagement. of saidsecondclutch.

10. Inl aamachinefhaving av reciprocable support, the combination ofactuating mech.-

vanism 4for. feeding and traversing said sup.

port` embodying a feed-traverse clutch arrangediwhen initsifeed positiontto inovethev p ii5 support in one ldirection'and when in itstraverseposition to` move thefsupport inthe v opposite direction,l'and'. a` control for said.,

clutch adapted for dogt actuation in=tWo1di` rectionsand operablewhenmoved in either directionto--movel said clutch to its disenif gagedVposition, sai dV control having a. load and iiredevicefoperable whenthecontrolis I movedin one directionto shift the clutchthrougli its'`disengaged position, and.means to disable said load and fire devicetopreL vent operation thereof.- Y Y `l1. In agmacliinehavingarreciprocable:Y

support, the combination. of. actuating mecheanism for feeding andtraversing saidV support:` embodying a: feed-traversey clutch areVranged when inV its feed position tomovethe support in one direction andwhen in its traverse position to move the support in the oppositedirection, and a control for said clutch C adapted for dog actuation intwo directions and operable when moved in either direction to move saidclutch to itsdisengaged position, said control having ay load and firedevice operable when the control is moved in 1one direction to shift theclutch through its disengaged position.

l2. In a machine having a reciprocable support, the combination ofmechanism for actuating said support embodying a pair of clutchesengageable to impart different movements to said' support, a control forsaid clutches adapted for dog actuationto disengage one of saidclutches, a loadand fire UJI device in said control operable afterdisengagement of said clutch to engage the other one of said clutches,and means to disable said -loa'd and fire device.

13., The combination of a reciprocable support, mechanism for actuatingsaid support including a first clutch engageable to impart one movementto said support, a Vsecond clutch engageable to impart'another move-Yone movement of said support and a second clutch-for obtaining anothermovement thereof, manually operable means for engaging either ofsaidclutches or for disengaging the same, trip operated controlmechanism arranged to actuate said manually` operable means to disengageeither of said clutches, said Vcontrol "mechanism having alost motionconnection to be closed before said first clutch may be disengaged, saidconnectionY embodying a load and iire device arranged to be loadedduring the closingY of said lost [motion connection and to move saidmanual control means to engage said second clutch immediately upondisengagement of said first clutch, and means to prevent loading of'saidload and fire device.

l5/The combination of aV reciprocating support, mechanism for actuatingsaid-' support embodying a feed-traverse clutch device operable in itsfeed position to move the support at a feed rate in vone direction andin its traverse position to move the support at traverse rate in theopposite direction, dog operated control means for said clutchautomatically operable "when said support is moved at a traverse ratethrough said clutch to stop said movement and when the supf..port is.movedat feed rate through said clutch to shift said clutch vto move thesupport at the traverse rate in the opposite direction, and meansfordisabling said control means to prevent such reversal of movement of thesupport. l

16. A feed mechanism for a movable support comprising, incombination, apair of feed-traverse clut'chdevices, gearing between said devices andthe support, said devices being reversely arranged and each beingoperable to feed the table in one direction and to traverse the table inthe opposite direc-- tion, and means. forautomatically operating saidclutches to stop a feeding movement of the table in one direction andtol initiate traverse movement thereof in the opposite direction. A

17. A feed change mechanism for a movable support, comprising, incombination, a feed-traverse clutch device, gearing between said deviceandV said support, said device and said gearing being arranged so thatsaid device may be engaged to feed the support in one direction or totraverse it in the opposite direction, trip means moving with saidsupport, and control means for said clutch engageable byy said tripmeans to stop feeding movement of the support by said device andinitiate traverse movement thereby, and to stop traverse movementthereby.

18. A feed change mechanism for a movable support, comprising incombination, a pair of feed-traverse clutch devices, gearing betweensaid devices and the support, a pair of trip devices one for controllingeach of said clutches, said trip devices each including a movable memberarranged to be moved in one direction to stop feeding movement of thesupport and in the opposite direction to stop traverse movement of saidsupport.

In testimony whereof, -I have hereunto affixed my signature.

GUsTAr DAviD sUNnsTnAND.

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